![](https://lemmyf.uk/pictrs/image/9f0816ab-4724-4773-b93f-29016e8204d7.jpeg)
Well, I would opt for a search through Kagi using the fediverse lense. But you basically edited your post on how it would need to be done otherwise And answered your own question. There’s also https://fedi-search.com/
The post ID isn’t universal when you’re putting it in another instance search bar. You have to use the entire URL of the originating instance.
If you know the url, that can be put into the search on instances too.